gram-negative

Adjective
  1. (of bacteria) being of or relating to a bacterium that does not retain the violet stain used in Gram's method (synset 301826582)
    referred to in: bacteria, bacterium - (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants
    similar to: disconfirming, negative - not indicating the presence of microorganisms or disease or a specific condition

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